Consider the circuit in the figure below; taking $E=6\mathrm{.}00V,L=8\mathrm{.}20mH,$ and $R=8\mathrm{.}00.$

$($a$)$ What is the inductive time constant of the circuit?

ms

$($b$)$ Calculate the current in the circuit $250s$ after the switch is closed.

What is the equation giving the current as a function of time in an RL circuit? A

$($c$)$ What is the value of the final steady$-$state current?

A

$($d$)$ After what time interval does the current reach $80\mathrm{.}0\%$ of its maximum value? ms